package com.zeros.myself.utils;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.v4.content.SharedPreferencesCompat;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;

/**
 * 偏好存储 on 2017/12/22.
 * @author zhy
 */

public class SPUtilsTwo {

    public static final String FILE_NAME = "share_data";    //保存在手机里面的文件名


    /**
     * 1. 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法
     */
    public static void put(Context context, String key, Object object) {
        SharedPreferences preferences = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = preferences.edit();

        if (object instanceof String)
            editor.putString(key, (String) object);
        else if (object instanceof Integer)
            editor.putInt(key, (Integer) object);
        else if (object instanceof Boolean)
            editor.putBoolean(key, (Boolean) object);
        else if (object instanceof Float)
            editor.putFloat(key, (Float) object);
        else if (object instanceof Long)
            editor.putLong(key, (Long) object);
        else
            editor.putString(key, object.toString());

        SharedPreferencesCompat.apply(editor);
    }


    /**
     * 2. 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值
     */
    public static Object get(Context context, String key, Object defaultObject) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);

        if (defaultObject instanceof String)
            return sp.getString(key, (String) defaultObject);
        else if (defaultObject instanceof Integer)
            return sp.getInt(key, (Integer) defaultObject);
        else if (defaultObject instanceof Boolean)
            return sp.getBoolean(key, (Boolean) defaultObject);
        else if (defaultObject instanceof Float)
            return sp.getFloat(key, (Float) defaultObject);
        else if (defaultObject instanceof Long)
            return sp.getLong(key, (Long) defaultObject);

        return null;
    }

    /**
     * 3. 移除某个key值已经对应的值
     */
    public static void remove(Context context, String key) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        editor.remove(key);
        SharedPreferencesCompat.apply(editor);
    }

    /**
     * 4. 清除所有数据
     */
    public static void clear(Context context) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        editor.clear();
        SharedPreferencesCompat.apply(editor);
    }


    /**
     * 5. 查询某个key是否已经存在
     */
    public static boolean contains(Context context, String key) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        return sp.contains(key);
    }

    /**
     * 6. 返回所有的键值对
     */
    public static Map<String, ?> getAll(Context context) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        return sp.getAll();
    }


    /**
     * 0. 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
     */
    private static class SharedPreferencesCompat {

        private static final Method sApplyMethod = findApplyMethod();

        //反射查找apply的方法
        @SuppressWarnings({"unchecked", "rawtypes"})
        private static Method findApplyMethod() {
            try {
                Class clz = SharedPreferences.Editor.class;
                return clz.getMethod("apply");
            } catch (NoSuchMethodException e) {
            }
            return null;
        }

        //如果找到则使用apply执行，否则使用commit
        public static void apply(SharedPreferences.Editor editor) {
            try {
                if (sApplyMethod != null) {
                    sApplyMethod.invoke(editor);
                    return;
                }
            } catch (IllegalArgumentException e) {
            } catch (IllegalAccessException e) {
            } catch (InvocationTargetException e) {
            }
            editor.commit();
        }
    }


}
